Power component for embroidery machine head, machine head assembly and embroidery machine

Abstract

The invention relates to the technical field of embroidery equipment, and provides a power assembly for an embroidery machine head capable of improving operation stability. The main shaft is connected with a needle rod driving device for driving the main shaft to rotate; the driving sleeve is fixedly sleeved on the main shaft; the needle bar linkage assembly comprises a liftable needle bar driving block, and a needle bar connecting part used for being connected with and driving a needle bar to ascend and descend is arranged on the liftable needle bar driving block. The presser foot driving device is independent of the main shaft and is provided with a liftable presser foot driving block and a presser foot driving motor, the presser foot driving block is provided with a presser foot connecting part, and the motor drives the presser foot driving block to ascend and descend. A needle bar driving convex arm and a balancing convex arm which protrude outwards are integrally formed on the periphery of the driving sleeve, are opposite in protruding direction and are respectively positioned on two sides of the main shaft. The needle bar driving protruding arm is connected with the needle bar driving block through a needle bar transmission assembly so that the protruding arm can drive the needle bar driving block to ascend and descend in a reciprocating mode when rotating along with the main shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of embroidery equipment, more particularly to an embroidery machine for performing embroidery work. BACKGROUND

[0002] Embroidery machines usually use needle bar driving cam link mechanisms to drive needle bars to move to achieve embroidery. However, the cam link mechanism has a large inertia during operation, which easily causes excessive vibration, thereby affecting the embroidery accuracy and reducing the quality of the embroidery product.

[0003] To improve the above problems, the prior art proposes to balance the rotational inertia of the needle bar driving cam by setting a balance cam, such as the double-needle embroidery machine head driving balance structure disclosed in document 1. However, in actual use, it is found that such balance structures often fail to achieve the theoretically expected balance effect, and the embroidery accuracy still needs to be further improved.

[0004] Document 1 is a Chinese patent document with publication number CN220485995U. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art and provide an embroidery machine head power assembly capable of improving operation stability, which is used to drive the needle bar to perform embroidery action and further improves the embroidery accuracy.

[0006] An embroidery machine head assembly and an embroidery machine having the above-mentioned embroidery machine head power assembly are also provided.

[0007] The overall technical solution of the present application is as follows:

[0008] The present application is formed based on how to form an embroidery machine head power assembly with better operation stability to further improve the embroidery accuracy when it is used to drive the needle bar to perform embroidery action. Specifically:

[0009] When the needle bar driving cam link mechanism drives the needle bar to move to achieve embroidery, the cam link mechanism has a large inertia during operation, which easily causes excessive vibration, resulting in large deviation of the embroidery action.

[0010] Therefore, a balancing cam is needed to be connected to the main shaft driving the cam linkage mechanism to balance the rotational inertia. However, while the balancing cam structure theoretically counteracts the inertial force of the needle bar driving cam through reverse inertia, its effectiveness is highly dependent on the absolute precision of parts machining and assembly. In actual assembly, factors such as cam profile errors, counterweight mass deviations, critical phase angle installation errors (such as small angular deviations), and alignment errors are coupled together, causing the inertia cancellation effect to fail to reach the theoretically expected level. At the same time, nonlinear factors such as cam linkage hinge gaps cannot be well balanced. These errors are further amplified during high-speed operation, making it difficult for the balancing structure to achieve the expected effect, and even introducing new vibrations, thus limiting the improvement of embroidery precision.

[0011] Based on this, the present invention proposes a power assembly for an embroidery machine head, comprising:

[0012] The main shaft is connected to a needle bar drive device that drives the main shaft to rotate.

[0013] The drive sleeve is fixedly fitted onto the spindle.

[0014] A needle bar linkage assembly includes a liftable needle bar drive block, the needle bar drive block having a needle bar connecting portion for connecting with the needle bar to drive the needle bar to move up and down;

[0015] A pressure foot drive mechanism independent of the spindle, comprising:

[0016] A liftable presser foot drive block has: a presser foot connecting part for connecting with the presser foot to drive the presser foot to rise and fall;

[0017] The presser foot drive motor is connected to the presser foot drive block so as to drive the presser foot drive block to rise and fall.

[0018] Among them, the outer peripheral surface of the drive sleeve has an outwardly protruding needle bar drive arm and a balance arm;

[0019] In the radial direction of the main shaft, the protrusions of the needle bar drive arm and the balance arm are in opposite directions and are located on both sides of the main shaft respectively;

[0020] Furthermore, both the needle bar drive arm and the balance arm are constructed to be integrally formed with the drive sleeve;

[0021] The needle bar drive arm and the needle bar drive block are also connected by a needle bar transmission assembly, which is configured to drive the needle bar drive block to reciprocate up and down when the needle bar drive arm rotates with the main shaft.

[0022] In the above solution, by identifying the causes of defects in existing balancing schemes, the driving unit and balancing unit that drive the needle bar for embroidery are integrally molded. The relative positional relationship between the two can be precisely fixed during manufacturing, avoiding the problem of poor inertial cancellation caused by factors such as installation errors in key phase angles of parts and centering errors. This fundamentally improves the accuracy and reliability of the spindle motion balance. Even when the spindle is rotating at high speeds, the balancing cam can generate a stable and precise reverse balancing torque on the movement of the needle bar drive cam, effectively suppressing spindle vibration and providing a smoother drive for the needle bar. This directly improves the embroidery accuracy when using the power component of this embroidery machine head.

[0023] The one-piece molding design also reduces the number of parts and the connection processes during assembly (such as bolt connections and key connections), reducing the risk of vibration caused by gaps due to loose connections and wear, making the entire power unit structure more compact, more rigid, and with a longer service life.

[0024] Furthermore, by independently setting the presser foot drive device, which can easily affect the rotational stability of the main shaft, the vibration of the main shaft can be further suppressed, thereby providing a smoother drive for the needle bar. On the other hand, it can provide a more stable and direct drive for the presser foot, further improving the embroidery accuracy when using the power component of this embroidery machine head.

[0025] One approach is to directly determine the size and weight of the balancing arm to create a balancing arm that meets the torque balance requirements. However, due to the high processing difficulty of the one-piece molding process, if all the counterweights required for balancing are integrated into the balancing arm itself (i.e., by increasing its volume and mass), the balancing arm may need to undergo asymmetrical, large-volume metal cutting or casting to achieve sufficient balancing torque. This significantly increases material costs, processing difficulty, and time, and may even affect the yield rate due to excessive structural complexity.

[0026] Therefore, in some implementations, the counterweight arm is connected to a counterweight assembly.

[0027] By separating the balance arm, which serves as the power output and phase control, from the counterweight component that optimizes the balancing effect, the drive sleeve (including the balance arm) can be integrally molded in a relatively standard and easy-to-process form while achieving spindle balance. This eliminates the need for an excessively complex design to accommodate large mass, improving manufacturability and controlling costs.

[0028] In some embodiments, the needle bar drive assembly includes:

[0029] The needle bar cam sleeve is an annular component sleeved outside the drive sleeve, and the inner circumferential surface of the annular component abuts against the needle bar drive cam arm so that the needle bar cam sleeve moves up and down reciprocally when the needle bar drive cam arm rotates with the main shaft.

[0030] The needle bar drive lever has one end fixed to the needle bar cam sleeve and the other end movably connected to the needle bar drive block through a connecting rod assembly, so that when the needle bar cam sleeve moves, it can drive the needle bar drive block to reciprocate up and down.

[0031] By setting up a needle bar transmission assembly that includes a needle bar cam sleeve and a needle bar drive rocker arm, the rotational motion of the drive cam arm is converted into the linear reciprocating motion of the cam sleeve, and then converted into the lifting motion of the needle bar drive block through the rocker arm and connecting rod. This forms an efficient, reliable, and backlash-controllable transmission method that can transmit power more accurately and smoothly, and optimize the precision of the needle bar drive action.

[0032] Furthermore, in some embodiments, the counterweight component includes:

[0033] The balance cam sleeve is an annular component sleeved outside the drive sleeve, and the inner circumferential surface of the annular component abuts against the balance cam arm so that the balance cam sleeve moves up and down reciprocally when the balance cam arm rotates with the main shaft.

[0034] The outer surface of the balance cam sleeve has a raised counterweight bar.

[0035] By specifically configuring the counterweight assembly to include a balance cam sleeve that engages with the balance cam arm and a balance counterweight rod, the counterweight assembly can dynamically respond to the movement of the balance cam arm (the balance cam sleeve moves up and down reciprocatingly). This configuration structurally matches the counterweight assembly with the needle bar drive assembly, forming a more symmetrical dynamic structure. This allows the balance cam arm to more accurately counteract the inertial force on the needle bar drive side, thereby further optimizing the dynamic balance effect and improving the stability of the overall spindle rotation.

[0036] Furthermore, in some embodiments, the counterweight assembly also includes:

[0037] A balancing fixed shaft is fixedly arranged.

[0038] The balance bar has one end hinged to the balance fixed shaft and the middle hinged to the balance counterweight bar, so that the other end of the balance bar can swing back and forth as the balance cam sleeve moves.

[0039] By setting up a balancing fixed shaft and a balancing pendulum, the technical problem of "uncontrolled movement trajectory and potential interference risk" that may occur with the balancing counterweight rod is further solved on the basis of achieving dynamic counterweight; it realizes precise guidance and constraint of the movement of the counterweight components, and significantly enhances the mechanical stability and reliability of the entire power unit while ensuring the balance effect.

[0040] At this point, a counterweight can be connected to the other end of the balance bar. Through the lever principle, the balance bar amplifies the small linear displacement of the balance cam sleeve into a larger swing amplitude at the counterweight end. This allows a smaller counterweight mass to generate a larger balancing torque, enabling the balancing force to act more effectively to counteract the vibration of the main shaft and improve balancing efficiency.

[0041] Furthermore, in some embodiments, a counterweight is connected to the other end of the balance bar, which swings synchronously with the balance bar and is configured to be detachably connected to the balance bar.

[0042] The use of detachable counterweights provides a simple and quick means of balance adjustment. Users can replace the counterweights with different masses as needed, enhancing the practicality and adaptability of the device and facilitating on-site debugging and maintenance.

[0043] Alternatively, in some embodiments, the other end of the balance bar is connected to a counterweight that swings synchronously with the balance bar and is configured to be hinged to the balance bar so as to be able to rotate to different counterweight positions.

[0044] The axis of rotation of the counterweight is parallel to the axis of the main shaft;

[0045] Furthermore, a locking structure is provided between the balance bar and the counterweight, which is configured such that when the counterweight is in any counterweight position, it can be driven to either a rotatable adjustment state or a non-rotatable locking state.

[0046] By setting the counterweight to rotate to different positions around the hinge point and fixing it with a locking structure, the balancing torque can be adjusted. Adjusting the angle of the counterweight changes its lever arm, thereby enabling precise calibration of the balancing effect. This makes it more suitable for high-speed, high-precision spindle rotation scenarios and better optimizes the stability of spindle operation.

[0047] In some embodiments, the outer peripheral surface of the drive sleeve also has an outwardly protruding thread-taking drive arm;

[0048] In the radial direction of the main shaft, the protrusion direction of the take-up drive arm and the needle bar drive arm is the same, and the two are distributed at intervals in the axial direction of the main shaft.

[0049] The take-up drive arm is connected to the take-up lever connecting shaft via the take-up drive assembly. The take-up lever connecting shaft is used to fix the take-up lever.

[0050] The line-carrying drive assembly is configured such that, as the line-carrying drive arm rotates with the main shaft, it drives the line-carrying rod connecting shaft to reciprocate around its own axis.

[0051] By adding a take-up drive arm that is axially spaced and aligned with the needle bar drive arm to the drive sleeve, and connecting it to the take-up drive assembly, the power integration and mechanical synchronization of the needle bar and the take-up lever are achieved. Furthermore, the balancing arm can directly and synchronously balance the inertia generated during the rotation of the needle bar drive arm and the take-up drive arm, thereby suppressing the vibration of the main shaft and providing a smoother drive for the needle bar. This directly improves the embroidery accuracy when using this embroidery machine head's power assembly.

[0052] The present invention also proposes a head assembly that includes a power component for an embroidery head as described in any of the above embodiments.

[0053] The present invention also proposes an embroidery machine that includes the aforementioned head assembly.

[0054] The main beneficial effects of the above technical solution are as follows:

[0055] This invention provides a power assembly for embroidery machine heads that, in practical use, better counteracts the rotational inertia of the needle bar drive arm, effectively suppressing spindle vibration and thus providing a smoother drive for the needle bar. Embroidery machines using this power assembly offer more stable and precise embroidery. Attached Figure Description

[0056] The present invention will now be further described with reference to the accompanying drawings.

[0057] Figure 1 This is a schematic diagram of the first structure of a power assembly for an embroidery machine head.

[0058] Figure 2 This is a schematic diagram of the layout of the needle bar drive arm and the balance arm.

[0059] Figure 3 This is a schematic diagram of the assembly of the power unit for an embroidery machine head.

[0060] Figure 4 This is a schematic diagram of the second structure of the power assembly for an embroidery machine head.

[0061] Figure 5 This is a schematic diagram of the third type of power assembly for an embroidery machine head.

[0062] Figure 6 This is a schematic diagram of the presser foot drive device.

[0063] Figure 7 This is a schematic diagram of the assembly of the power unit for the embroidery machine head. Detailed Implementation

[0064] The present invention will be illustrated with specific examples below.

[0065] Example 1:

[0066] The power unit of the embroidery machine head is used to drive the needle bar for embroidery to move back and forth, and simultaneously drive the presser foot to move up and down, so as to provide power for the embroidery action.

[0067] like Figure 1 As shown, the power assembly for the embroidery machine head in this embodiment includes a rotatable main shaft 1. The main shaft 1 is connected to a needle bar drive device that drives the main shaft 1 to rotate via a transmission structure, such as a gear transmission structure or a transmission belt. The needle bar drive device can be a motor, and its rotating shaft is connected to the main shaft 1 via a transmission structure to drive the main shaft 1 to rotate and generate power.

[0068] It also includes a needle bar linkage assembly 3, which includes a vertically extending guide rod 3.1 and a needle bar drive block 3.2 fitted on the guide rod 3.1. The needle bar drive block 3.2 can move up and down on the guide rod 3.1.

[0069] The needle bar drive block 3.2 has a needle bar connecting portion 3.21, which is configured to connect with the needle bar and, after connection, drive the needle bar to move up and down. For example, the needle bar is typically arranged vertically and has a horizontally protruding locking block on its surface; the needle bar connecting portion 3.21 is provided with a slot for the locking block to be inserted in the horizontal direction. By inserting the locking block into the slot structure of the needle bar connecting portion 3.21, the connection between the needle bar and the needle bar drive block 3.2 is realized, and the needle bar drive block 3.2 can drive the needle bar to move up and down when it moves up and down to form an embroidery action.

[0070] like Figure 1 As shown, a drive sleeve 2 is fixedly sleeved around the main shaft 1. The outer circumferential surface of the drive sleeve 2 has outwardly protruding needle bar drive convex arm 2.1 and balance convex arm 2.2. In the radial direction of the main shaft 1, the direction in which the needle bar drive convex arm 2.1 protrudes relative to the drive sleeve 2 is opposite to the direction in which the balance convex arm 2.2 protrudes relative to the drive sleeve 2, and the needle bar drive convex arm 2.1 and balance convex arm 2.2 are located on both sides of the main shaft 1.

[0071] Specifically, the outer circumferential surface of the drive sleeve 2 has a needle bar drive protrusion 2.1 that protrudes radially along the main shaft 1, and the outer circumferential surface of the drive sleeve 2 also has a balance protrusion 2.2 that protrudes radially along the main shaft 1. The needle bar drive protrusion 2.1 protrudes at one end along a certain diameter direction of the main shaft 1, and the balance protrusion 2.2 protrudes at the other end along a certain diameter direction of the main shaft 1; for example, when the drive sleeve 2... Figure 2When placed in the position shown, it has a needle bar drive convex arm 2.1 protruding to the left on the left side and a balance convex arm 2.2 protruding to the right on the right side, so that the protrusion directions of the needle bar drive convex arm 2.1 and the balance convex arm 2.2 are opposite, and the needle bar drive convex arm 2.1 and the balance convex arm 2.2 are located on the left and right sides of the main shaft 1, respectively.

[0072] Among them, the needle bar drive protrusion 2.1 and the drive sleeve 2 are integrally formed, and the balance protrusion 2.2 is also integrally formed with the drive sleeve 2.

[0073] like Figure 2 As shown, the needle bar drive arm 2.1 and the needle bar drive block 3.2 are also connected by a needle bar transmission assembly 4. The needle bar transmission assembly 4 is configured such that when the needle bar drive arm 2.1 rotates with the main shaft 1, it can drive the needle bar drive block 3.2 to reciprocate up and down.

[0074] Specifically, such as Figure 3 As shown, in this embodiment, the needle bar transmission assembly 4 includes: a needle bar cam sleeve 4.1, a needle bar drive rocker arm 4.2, and a connecting rod assembly.

[0075] The needle bar cam sleeve 4.1 is an annular component that is sleeved outside the drive sleeve 2 and surrounds the needle bar drive protrusion 2.1. The annular component can move relative to the drive sleeve 2, and its inner circumferential surface abuts against the needle bar drive protrusion 2.1. When the needle bar drive protrusion 2.1 rotates with the main shaft 1, the needle bar drive protrusion 2.1 rotates in the annular component, and the end of the needle bar drive protrusion 2.1 abuts against the inner circumferential surface of the annular component, forming a disc cam mechanism, which pushes the needle bar cam sleeve 4.1 to move up and down reciprocally.

[0076] One end of the needle bar drive lever 4.2 is fixed to the needle bar cam sleeve 4.1, and the other end is movably connected to the needle bar drive block 3.2 through a connecting rod assembly, so that when the needle bar cam sleeve 4.1 moves up and down, it can drive the needle bar drive block 3.2 to move up and down, that is, to move up and down.

[0077] In this embodiment, the linkage assembly includes a connecting rocker arm 4.3, the middle of which is hinged to the needle bar drive rocker arm 4.2, allowing it to rotate relative to the needle bar drive rocker arm 4.2. One end of the connecting rocker arm 4.3 is hinged to a positioning and fixing shaft 4.4, allowing it to rotate relative to the positioning and fixing shaft 4.4; the positioning and fixing shaft 4.4 extends laterally and is fixed, for example, to the housing 11 described below. The other end of the connecting rocker arm 4.3 is connected to a drive block connecting rod 4.5, one end of which is hinged to the other end of the connecting rocker arm 4.3, allowing it to rotate relative to the connecting rocker arm 4.3; the other end of the drive block connecting rod 4.5 is hinged to the needle bar drive block 3.2, allowing it to rotate relative to the needle bar drive block 3.2. The rotation axes of the aforementioned hinged rotating structures are all parallel to the axis of the main shaft 1.

[0078] In this embodiment, the needle bar drive arm 2.1 and the balance arm 2.2 are arranged at intervals along the axial direction of the main shaft 1. Furthermore, the balance arm 2.2 is connected to a counterweight assembly 5.

[0079] like Figure 3 As shown, in this embodiment, the counterweight assembly 5 includes at least: a balance cam sleeve 5.1 and a balance counterweight rod 5.2. It may also include: a balance fixed shaft 5.3, a balance pendulum rod 5.4, and a counterweight block 5.5.

[0080] Specifically, the balance cam sleeve 5.1 is an annular component that is sleeved outside the drive sleeve 2 and surrounds the balance cam arm 2.2. The annular component can move relative to the drive sleeve 2, and its inner circumferential surface abuts against the balance cam arm 2.2. When the balance cam arm 2.2 rotates with the main shaft 1, the balance cam arm 2.2 rotates in the annular component, and the end of the balance cam arm 2.2 abuts against the inner circumferential surface of the annular component, forming a disc cam mechanism, which drives the balance cam sleeve 5.1 to move up and down reciprocally.

[0081] The outer circumferential surface of the balance cam sleeve 5.1 has an outwardly protruding balance counterweight rod 5.2.

[0082] The balancing shaft 5.3 extends laterally and is fixed, for example, to the housing 11 described below. One end of the balance arm 5.4 is hinged to the balancing shaft 5.3 to rotate relative to it; the middle of the balance arm 5.4 is hinged to the counterweight rod 5.2 via a pin 5.6 to rotate relative to it. As the balance cam sleeve 5.1 rotates with the balance cam arm 2.2, it moves up and down reciprocally, causing the other end of the balance arm 5.4 to swing up and down reciprocally.

[0083] like Figure 2 As shown, the other end of the balance bar 5.4 can also be connected to a counterweight 5.5, which swings synchronously with the balance bar 5.4.

[0084] The counterweight 5.5 can be non-detachably fixed to the balance bar 5.4 by means of welding, for example.

[0085] Alternatively, the counterweight 5.5 can be detachably connected to the balance bar 5.4 using, for example, screws.

[0086] Alternatively, the counterweight 5.5 is hinged to the balance rod 5.4 to rotate to different counterweight positions; the axis of rotation of the counterweight 5.5 is parallel to the axis of the main shaft 1. Furthermore, a locking structure is provided between the balance rod 5.4 and the counterweight 5.5, configured such that when the counterweight 5.5 is in any counterweight position, it can be driven into a rotatable adjustment state or a non-rotatable locked state.

[0087] For example, the counterweight 5.5 is fixed with a positioning shaft 5.7, which is hinged to the other end of the balance rod 5.4 so that it can rotate relative to the balance rod 5.4, with its rotation axis parallel to the axis of the main shaft 1. At this time, the counterweight 5.5 can rotate relative to the balance rod 5.4 to different counterweight positions.

[0088] The balance bar 5.4 can be equipped with a clamping structure for the positioning shaft 5.7, which forms a locking structure. By fixing and clamping the positioning shaft 5.7, even if the positioning shaft 5.7 is fixed and cannot rotate, the counterweight 5.5 is in a locked state and thus positioned at a certain counterweight position; by releasing the clamping action on the positioning shaft 5.7, the positioning shaft 5.7 can rotate, and the counterweight 5.5 can be adjusted to rotate to the desired counterweight position.

[0089] The balance rod 5.4 can also be screwed with a screw to form a locking structure. The end of the screw is used to press against the side of the positioning shaft 5.7. By turning the screw, the screw is driven to press against the positioning shaft 5.7, making it immovable, so that the counterweight 5.5 is in a non-rotatable locked state; by driving the screw away from the positioning shaft 5.7, the pressing effect is released, so that the counterweight 5.5 is in a rotatable adjustment state.

[0090] Based on the above scheme, a part for driving the presser foot to rise and fall is also provided.

[0091] Referring to the existing structure of some embroidery machines, the part used to drive the presser foot to rise and fall can be like the needle bar drive block 3.2 mentioned above, which is connected to the main shaft 1 through a cam linkage structure. The main shaft 1 provides power to the part used to drive the presser foot to rise and fall, so that the part can drive the presser foot to rise and fall.

[0092] However, when the presser foot is used to press the fabric, it is easy to generate a large reaction force, which affects the rotational balance of the main shaft 1. Moreover, the presser foot often requires a large amount of power to drive it in order to press the fabric more stably.

[0093] Based on this, this embodiment is provided with a presser foot drive device 10 that is independent of the spindle 1, which includes a presser foot drive block 10.1, a presser foot drive motor 10.2, and a presser foot connecting rod assembly.

[0094] Among them, such as Figure 5 As shown, a pressure foot drive block 10.1 is mounted on the guide rod 3.1, which can move up and down on the guide rod 3.1.

[0095] The presser foot drive block 10.1 has a presser foot connecting portion 10.11, which is configured to connect with the presser foot and drive the presser foot to move up and down after connection. For example, the surface of the presser foot is provided with a horizontally protruding locking block; the presser foot connecting portion 10.11 is provided with a slot for the locking block to be inserted in the horizontal direction. By inserting the locking block into the presser foot connecting portion 10.11 of the slot structure, the connection between the presser foot and the presser foot drive block 10.1 can be realized, and the presser foot can be driven to move up and down when the presser foot drive block 10.1 moves up and down.

[0096] The presser foot drive motor 10.2 is, for example, a rotary motor, which has an output shaft 10.21 for outputting rotational power. An output rod 10.3 is fixedly connected to the output shaft 10.21, and the output rod 10.3 rotates with the output shaft 10.21.

[0097] like Figure 6 As shown, the output rod 10.3 is connected to the presser foot drive block 10.1 via a presser foot swing rod 10.5, one end of which is hinged to a presser foot positioning shaft 10.6. The presser foot positioning shaft 10.6 is fixedly arranged, for example, it is fixed to the housing 11 described below during use. The swing rod 10.5 can rotate relative to the presser foot positioning shaft 10.6, and its axis of rotation is parallel to the axis of the main shaft 1.

[0098] like Figure 6 As shown, the swing rod 10.5 and the output rod 10.3 are connected by a first connecting rod 10.4. One end of the first connecting rod 10.4 is rotatably hinged to the output rod 10.3, and the other end of the first connecting rod 10.4 is rotatably hinged to the middle of the swing rod 10.5.

[0099] The swing arm 10.5 is connected to the presser foot drive block 10.1 via a second link 10.7. One end of the second link 10.7 is rotatably hinged to the other end of the swing arm 10.5 (i.e. the end away from the presser foot positioning shaft 10.6), and the other end of the second link 10.7 is rotatably hinged to the presser foot drive block 10.1.

[0100] When the above-mentioned embroidery machine head is used with a power unit:

[0101] The needle bar connecting part 3.21 is connected to the needle bar. The needle bar drive device drives the main shaft 1 to rotate. The main shaft 1 can then drive the needle bar drive block 3.2 to reciprocate up and down through the needle bar drive arm 2.1 and the needle bar transmission assembly 4, thereby driving the needle bar to reciprocate up and down to perform the embroidery action.

[0102] During this process, the balance arm 2.2 rotates synchronously and drives the counterweight block 5.5 to swing through the balance cam sleeve 5.1, the balance counterweight rod 5.2 and the balance pendulum 5.4, so as to balance the rotational inertia formed by the needle bar drive arm 2.1 driving the needle bar to move.

[0103] The presser foot drive motor 10.2 drives the output shaft 10.21 to rotate, and through the output rod 10.3, the first connecting rod 10.4, the swing rod 10.5 and the second connecting rod 10.7, drives the presser foot drive block 10.1 to move up and down, so that when the presser foot is fixed to the presser foot, it can cooperate with the embroidery action to drive the presser foot to move up and down to press the fabric.

[0104] Example 2:

[0105] The power unit of the embroidery machine head is used to drive the needle bar for embroidery to move back and forth, and simultaneously drive the take-up lever 7 to swing, so as to provide power for the embroidery action.

[0106] In this embodiment, based on the first embodiment, a part for driving the line-following lever 7 to swing is also provided.

[0107] Specifically, such as Figure 4 As shown, the outer circumferential surface of the drive sleeve 2 also has an outwardly protruding thread take-up drive arm 6.1. In the radial direction of the main shaft 1, the thread take-up drive arm 6.1 and the needle bar drive arm 2.1 have the same protrusion direction, and they are spaced apart in the axial direction of the main shaft 1. The thread take-up drive arm 6.1 is connected to the thread take-up rod connecting shaft 9 through the thread take-up drive assembly. The thread take-up rod connecting shaft 9 is used to fix the thread take-up rod 7. The thread take-up drive assembly is configured such that when the thread take-up drive arm 6.1 rotates with the main shaft 1, it drives the thread take-up rod connecting shaft 9 to reciprocate around its own axis.

[0108] For example Figure 4 As shown, the drive sleeve 2 is fitted with a cam disk 6 surrounding it. The cam disk 6 is provided with a groove 6.2, which is an annular groove extending around the main shaft 1. The annular groove surrounds a cam structure, which forms a thread-picking drive cam arm 6.1.

[0109] A line-fetching link 8 is provided on the outside of the cam disk 6, and a roller is hinged to one end of the link. The roller can rotate relative to the line-fetching link 8, and the axis of rotation is parallel to the axis of the main shaft 1. The roller is inserted into the slide groove 6.2 so that it can slide along the trajectory of the slide groove 6.2, and the roller itself can also rotate during the sliding process.

[0110] The other end of the line-lifting rod 8 is fixedly connected to a rotatable line-lifting rod connecting shaft 9, which can be rotatably connected to the housing 11 as described below during use. The line-lifting rod connecting shaft 9 is configured to provide a fixed connection for the line-lifting rod 7.

[0111] When using the power unit for the embroidery machine head:

[0112] In addition to driving the needle bar drive arm 2.1 and balance arm 2.2 to swing as described in Embodiment 1, the main shaft 1 drives the cam disk 6 to rotate, thereby driving the roller to move in the slide groove 6.2, thereby driving the take-up connecting rod 8 to swing, and driving the take-up rod connecting shaft 9 to reciprocate around its own axis, so that when the take-up rod connecting shaft 9 is fixedly connected to the take-up rod 7, it can drive the take-up rod 7 to swing up and down synchronously to take up the thread.

[0113] Example 3:

[0114] Head assembly, such as Figure 7 As shown, it includes a housing 11, a power assembly for the embroidery machine head as in Embodiment 1 or Embodiment 2, and other embroidery machine head components other than the housing 11 and the power assembly for the embroidery machine head. This part of the structure follows the existing structure and is not an improvement of this application, so it will not be described in detail here.

[0115] The needle bar drive arm 2.1 and the balance arm 2.2 in the power assembly of the embroidery machine head can both be housed in the housing 11.

[0116] Example 4:

[0117] The embroidery machine includes the head assembly as described in Embodiment 3, as well as other embroidery machine components other than the head assembly. These components follow the existing structural settings and are not improvements of this application, so they will not be described in detail here.

[0118] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Furthermore, the terms "vertical," "horizontal," "front," and "rear," etc., mentioned in the embodiments of the present invention indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be further noted that, unless otherwise explicitly specified and limited, terms such as "install," "connect," "join," and "fix" in the description should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0119] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. Power assembly for embroidery machine head, including: The main shaft is connected to a needle bar drive device that drives the main shaft to rotate. A drive sleeve, which is fixedly sleeved on the main shaft; A needle bar linkage assembly includes a liftable needle bar drive block, the needle bar drive block having a needle bar connecting portion for connecting with the needle bar to drive the needle bar to move up and down; Its characteristic is that it further includes: The presser foot drive device, independent of the spindle, includes: A liftable presser foot drive block has: a presser foot connecting part for connecting with the presser foot to drive the presser foot to rise and fall; A presser foot drive motor is connected to the presser foot drive block so as to drive the presser foot drive block to rise and fall. The outer peripheral surface of the drive sleeve has an outwardly protruding needle bar drive arm and a balance arm; In the radial direction of the main shaft, the protrusions of the needle bar drive arm and the balance arm are opposite and are located on both sides of the main shaft, respectively. Furthermore, both the needle bar drive arm and the balance arm are constructed to be integrally formed with the drive sleeve; The needle bar drive arm and the needle bar drive block are also connected by a needle bar transmission assembly, which is configured to drive the needle bar drive block to reciprocate up and down when the needle bar drive arm rotates with the main shaft.

2. The power assembly for an embroidery machine head according to claim 1, characterized in that: The balancing arm is connected to a counterweight assembly.

3. The power assembly for an embroidery machine head according to claim 2, characterized in that: The needle bar drive assembly includes: The needle bar cam sleeve is an annular component sleeved outside the drive sleeve, and the inner circumferential surface of the annular component abuts against the needle bar drive convex arm so that the needle bar cam sleeve moves up and down reciprocally when the needle bar drive convex arm rotates with the main shaft. The needle bar drive lever has one end fixed to the needle bar cam sleeve and the other end movably connected to the needle bar drive block via a connecting rod assembly, so that when the needle bar cam sleeve moves, it can drive the needle bar drive block to reciprocate up and down.

4. The power assembly for an embroidery machine head according to claim 3, characterized in that: The counterweight assembly includes: The balance cam sleeve is an annular component sleeved outside the drive sleeve, and the inner circumferential surface of the annular component abuts against the balance cam arm so that the balance cam sleeve moves up and down reciprocally when the balance cam arm rotates with the main shaft. The outer surface of the balance cam sleeve has a raised balance weight rod.

5. The power assembly for an embroidery machine head according to claim 4, characterized in that: The counterweight assembly also includes: A balancing fixed shaft is fixedly arranged. A balance pendulum, one end of which is hinged to the balance fixed shaft and the middle part is hinged to the balance counterweight rod, so that the other end of the balance pendulum can swing back and forth as the balance cam sleeve moves.

6. The power assembly for an embroidery machine head according to claim 5, characterized in that: The other end of the balance bar is connected to a counterweight, which swings synchronously with the balance bar and is configured to be detachably connected to the balance bar.

7. The power assembly for an embroidery machine head according to claim 5, characterized in that: The other end of the balance bar is connected to a counterweight block, which swings synchronously with the balance bar and is configured to be hinged to the balance bar so as to be able to rotate to different counterweight positions. The axis of rotation of the counterweight is parallel to the axis of the main shaft; Furthermore, a locking structure is provided between the balance bar and the counterweight, which is configured such that when the counterweight is in any counterweight position, it can drive the counterweight to either a rotatable adjustment state or a non-rotatable locking state.

8. The power assembly for an embroidery machine head according to any one of claims 1 to 7, characterized in that: The outer peripheral surface of the drive sleeve also has an outwardly protruding thread-taking drive arm; In the radial direction of the main shaft, the protrusion direction of the thread take-up drive arm and the needle bar drive arm is the same, and the two are distributed at intervals in the axial direction of the main shaft. The thread-lifting drive arm is connected to the thread-lifting rod connecting shaft via the thread-lifting drive assembly. The thread-lifting rod connecting shaft is used to fix the thread-lifting rod. The line-taking drive assembly is configured such that, when the line-taking drive arm rotates with the main shaft, it drives the line-taking rod connecting shaft to reciprocate around its own axis.

9. The head assembly, characterized in that: It includes a power assembly for an embroidery machine head as described in any one of claims 1 to 8.

10. An embroidery machine, characterized in that: It includes the head assembly as described in claim 9.

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